Alloy.



UNITED STATES PATENT OFFICE.

ALFRED H. SMITH, ()F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY

MESNE ASSIGNMENTS, TO AMERICAN BRONZE COMPANY, CORPORA- TION OF PENNSYLVANIA.

ALLOY;

Patented April 9, 1907.

Application filed October 25, 1906. Serial No. 340,508.

To 077/ 114mm if may eon/(tern:

Be it known that I, ALFRED II. SMITH, a subject of the King of Great Britain, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Alloys of which the following is a specification;

One object of my invention is to provide an alloy which while being useful in any branch of the arts requiring a bronze shall be par IO ticularly adapted for use as a bearing metal and which shall be relatively hard and possess superior wearing qualities.

1 further desire to provide a. process where by my improved alloy may be made.

In carrying out my vcntion 1 first provide an intimate mixi 0 consisting oi salannnoniae or salt and potash in about the proportions of one pound of the former to one ounce of the latter. I then melt about twentv pounds ol spelter or zinc anu while maintiiining this at it's melting heat add to it about eighty pounds ol' tin. Said tin should be added in small quantities, and the spelter should be maintained at its melting heat until the tin is cmnplctely incorporated with it. While this metallic mixture of tin and zinc is maintained at its melting heat, l add about four ounces ol the first mixture, stirring the whole thoroughly until all fumes have disappeared. 'lhe crucible containing the resulting compound is then removed lrom the lurnace and the metal poured into relatively small ingots. This compound .l shall herealt-errelcr to as the toundat ion metal." l

then melt about twenty pounds ol copper, nd while maintaining this at its melting heat I add to it about. three pounds two ounces of 1 the foundation metal, while constantly stirring the whole. The l'urnace is now closed. 40 and alter the nictal has been heated or cooked lor about ten minutes it is remo\ ed and altcr athorough stirring is poured. into ingots. While this resulting metallic. com? pound may be employed as'a final or iinished '45 product, I have lound'that the best results are. secured by making another lotol" the alloy and adding to it. while at its melting heat an amount ol the first Lgateh obtained equal in weight to about one-hall" ol that ol the second'lmtch. -'lhis metal.ot' the first lmteh-shouldbe added in small quantities while the. second batch maintained at its melting heat. lhe resulting 'linal com- 1 pound should then be heated to a relatively high temperature before removal from the furnace and stirred thoroughly before pouring, into molds.

l have found under practical conditions in making successive batches of my im )roved alloy that the most satisfactory resu ts are secured it after a batch has been made which consists ol" sal-ammoniac, potash, tin, zinc, and copper, as above described, there be added to it one-half of its weightof previously-premred alloy such as is always on hand from the gates of previous castings.

I claim as my invention P l. The process which consists in adding a mixture containing sal-ammoniac and potash to a mixtureol' zinc and tin, and then eombin- 7o ing said mixture with copper, Substantially as described. a

2. The process which consists in adding a mixture of s.-1lammoniac and potash to a mixture ol' tin and zinc, adding the resulting compound to a-body ol copper, and finally mixing the resulting alloy with a body of previol[sly-made alloy having substantially the same composition. substantially as de-. scribed.

$3, The process which consists in adding a mixture ot a chlorid and a hydrate of an alkali metal or metals to a mixture ol tin and Zinc. and then adding the resulting com.- pouml to a body ol' copper, substantially as described. v

l. The process which consists in adding tin to melted zinc 111 about the proportion of tour parts ol' the l'oriner to one oi the latter, adding to the resulting mixture a mixture 0 consisting ol a chlorid and a'hydmte ol' an' alkali metal or metals in the proportion of one pound ol" the l'ormer to one ounce of the latter. then adding to a body of melted c p I per an amount ol" the resulting compound in 5 about the proportion ol' twenty pounds ol" copper to three pounds two ounces of said compoumh substantially as descrilaal.

The process which consists in adding tin to melted Zinc in about the proportion oi four parts of the l'ormer to one ol the latter, adding to the resulting mixture a mixture consisting of a chlorid and a hydrate of an alkali metal or metals in the proportion of one pound of the l'ormer to one ounce ol the tat-tor, then adding to a. body of lnelterheoper a body of the compound previously ,onned in about thepropurthm of twenty pounds of copper to chm poumls two ounues of the limit-Q1, and finally adding to'tho alloy a body of previeusly-nmde alloy in fihe pro-- porticn of awe parts of the former t6 one of ihe 1:111:61, subsmntialiy described.

In testimony whereof I h m signed my name to this specification in. the prmnwe of two subscribing Witnesses.

- ALFRED H. TH.

Witsesrses:

ROBERT KAP ER, J05. H. K 

